This U-Bahn station was built at the beginning of the XX Century and was originally named Warschauer Brücke. It was the end station of Berlin’s first over ground railway, which today is the U1 line which, although technically a subway line, runs most of it’s course over ground, on a steel bridge spanning over Kreuzberg and Mitte districts.
The station in built in Jugendstil style with heavy influences on the Gründerzeitstil, drawing heavily form Germany’s mythical past.
The station was mostly opened though the war and the later turmoil, up until the building of the Berlin Wall in 1961, when the station found itself on the East German side, whereas the U1 line was in the west.
From that time the station was closed and served as a warehouse, being reopened in 1995 after major reconstruction that started after the reunification of Germany.
See my other entries on Berlin’s subway stations: